diff options
Diffstat (limited to 'ArmPlatformPkg/Drivers/SP804TimerDxe/SP804Timer.c')
| -rw-r--r-- | ArmPlatformPkg/Drivers/SP804TimerDxe/SP804Timer.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/ArmPlatformPkg/Drivers/SP804TimerDxe/SP804Timer.c b/ArmPlatformPkg/Drivers/SP804TimerDxe/SP804Timer.c index 159e9256a1..aa4c4d6dcc 100644 --- a/ArmPlatformPkg/Drivers/SP804TimerDxe/SP804Timer.c +++ b/ArmPlatformPkg/Drivers/SP804TimerDxe/SP804Timer.c @@ -29,16 +29,16 @@ #include <Drivers/SP804Timer.h> -#define SP804_TIMER_PERIODIC_BASE (UINTN)PcdGet32 (PcdSP804TimerPeriodicBase) -#define SP804_TIMER_METRONOME_BASE (UINTN)PcdGet32 (PcdSP804TimerMetronomeBase) -#define SP804_TIMER_PERFORMANCE_BASE (UINTN)PcdGet32 (PcdSP804TimerPerformanceBase) +#define SP804_TIMER_PERIODIC_BASE ((UINTN)PcdGet32 (PcdSP804TimerPeriodicBase)) +#define SP804_TIMER_METRONOME_BASE ((UINTN)PcdGet32 (PcdSP804TimerMetronomeBase)) +#define SP804_TIMER_PERFORMANCE_BASE ((UINTN)PcdGet32 (PcdSP804TimerPerformanceBase)) // The notification function to call on every timer interrupt. -volatile EFI_TIMER_NOTIFY mTimerNotifyFunction = (EFI_TIMER_NOTIFY)NULL; -EFI_EVENT EfiExitBootServicesEvent = (EFI_EVENT)NULL; +EFI_TIMER_NOTIFY mTimerNotifyFunction = (EFI_TIMER_NOTIFY)NULL; +EFI_EVENT EfiExitBootServicesEvent = (EFI_EVENT)NULL; // The current period of the timer interrupt -volatile UINT64 mTimerPeriod = 0; +UINT64 mTimerPeriod = 0; // Cached copy of the Hardware Interrupt protocol instance EFI_HARDWARE_INTERRUPT_PROTOCOL *gInterrupt = NULL; @@ -78,10 +78,10 @@ TimerInterruptHandler ( // If the interrupt is shared then we must check if this interrupt source is the one associated to this Timer if (MmioRead32 (SP804_TIMER_PERIODIC_BASE + SP804_TIMER_MSK_INT_STS_REG) != 0) { - // clear the periodic interrupt + // Clear the periodic interrupt MmioWrite32 (SP804_TIMER_PERIODIC_BASE + SP804_TIMER_INT_CLR_REG, 0); - // signal end of interrupt early to help avoid losing subsequent ticks from long duration handlers + // Signal end of interrupt early to help avoid losing subsequent ticks from long duration handlers gInterrupt->EndOfInterrupt (gInterrupt, Source); if (mTimerNotifyFunction) { @@ -213,15 +213,13 @@ TimerDriverSetTimerPeriod ( // Disable timer 0/1 interrupt for a TimerPeriod of 0 Status = gInterrupt->DisableInterruptSource (gInterrupt, gVector); } else { - // Convert TimerPeriod into 1MHz clock counts (us units = 100ns units / 10) + // Convert TimerPeriod into 1MHz clock counts (us units = 100ns units * 10) TimerTicks = DivU64x32 (TimerPeriod, 10); TimerTicks = MultU64x32 (TimerTicks, PcdGet32(PcdSP804TimerFrequencyInMHz)); // if it's larger than 32-bits, pin to highest value if (TimerTicks > 0xffffffff) { - TimerTicks = 0xffffffff; - } // Program the SP804 timer with the new count value |